Hydrogen combustion in internal combustion engines is an attractive candidate for addressing climate change owing to its near-zero emissions. Hydrogen fuel has been studied in spark ignition (SI) engines and showed a high octane sensitivity, denoted as the difference between RON and MON. The only harmful emissions from hydrogen combustion in SI mode are nitrogen oxides as a result of high temperature nitrogen oxidation reactions. Homogeneous Charge Compression Ignition (HCCI) is a low temperature combustion technology that can potentially solve the problem of NOx emissions, at the same time achieving higher thermodynamic efficiency. Several studies have investigated the combustion of pure hydrogen in HCCI mode at different operating conditions. However, there has not been a comparison between hydrogen and reference hydrocarbon fuels, such as n-heptane and iso-octane. The present study focuses on evaluating the HCCI performance of hydrogen in the light of the Lund-Chevron HCCI fuel number. The experiments are conducted in a modified Cooperative Fuel Research (CFR) engine to run in HCCI conditions using hydrogen port injection. Here, the auto-ignition of hydrogen is compared to the auto-ignition of reference fuels at different engine speeds and intake temperatures. The results show that hydrogen HCCI combustion is sensitive to engine operating conditions with hydrogen behaving as a high octane fuel at low engine speeds and intake temperature, while low octane rating is encountered with increasing speed and intake temperature. The study also sheds light on the problems and drawbacks associated with hydrogen combustion in HCCI engines, as well as potential solutions to such problems.
Abdulrahman obtained his bachelor degree in Mechanical engineering from King Fahd University of petroleum and minerals (KFUPM) in 2017. He then joined ROSEN technologies as a research engineer in the field of non-destructive testing of oil pipelines. In 2018, He joined KAUST as a master student and defended his thesis about the Argon power cycle under the supervision of Professor Bengt Johansson and Professor R. W. Dibble. He is now a PhD student in Professor Mani Sarathy group. His research focuses on the utilization of next generation carbon-free fuels such as hydrogen and ammonia in internal combustion engines.
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